circumference = 2 pi r
2 pi (100 - 90)
= 20 pi
= 20 * 3.14159 approximately
A circular race track is being built. The outsidediameter of the track is 200 feet, and the inside diameter is 180 feet. If two runners run around the track once, with one of them running on the outside edge of the track, while the other is running on the inside edge, how much further will the outside runner have to run?
5 answers
where did 100 and 90 come from
d1 = pi*2r = 3.14*200 = 628 Ft.
d2 = pi*2r = 3.14*180 = 565 Ft.
d1-d2 = 628-565 = 63 Ft.
d2 = pi*2r = 3.14*180 = 565 Ft.
d1-d2 = 628-565 = 63 Ft.
this question is also referring to the question above:
Referring to the runners in the preceding problem, if the runners both run at a speed of 6 miles per hour, how much time will elapse between the first runner finishing and the second runner finishing. Assume they start at the same time.
Referring to the runners in the preceding problem, if the runners both run at a speed of 6 miles per hour, how much time will elapse between the first runner finishing and the second runner finishing. Assume they start at the same time.
d1 = (628/5280) * 1mi = 0.119 mi
d2 = (565/5280) * 1 mi = 0.107 mi.
V1*T1 = 0.119
6T1 = 0.119
T1 = 0.0198 h = 1.19 min.
V2*T2 = 0.107
6T2 = 0.107
T2 =
T = T1-T2 =
d2 = (565/5280) * 1 mi = 0.107 mi.
V1*T1 = 0.119
6T1 = 0.119
T1 = 0.0198 h = 1.19 min.
V2*T2 = 0.107
6T2 = 0.107
T2 =
T = T1-T2 =